LED
LCD
Product Overview
The 20mm LDR is a professional-grade light sensor designed for environments where precision and durability are non-negotiable. Its massive sensing area allows it to average light levels over a wider surface, making it remarkably stable against “noise” from tiny moving shadows or flickering light sources. This model is frequently used in industrial controllers and high-end weather stations because it can handle higher voltages and power than common 5mm sensors.
How to Use & Connections
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Maximum Sensitivity: The jumbo surface area makes it exceptionally responsive to very low light levels (twilight/moonlight).
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Power Handling: Its larger physical size allows for better heat dissipation, making it suitable for circuits with higher current demands.
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Stable Integration: Pairs perfectly with a 50KΩ or 100KΩ potentiometer to create a precision light-trigger threshold for microcontrollers or analog comparators.
Technical Specifications
| Feature | Specification |
| Diameter | 20mm |
| Light Resistance (10 Lux) | 2KΩ – 10KΩ (Ultra-low resistance for high sensitivity) |
| Dark Resistance (0 Lux) | 5MΩ – 20MΩ (Superior isolation) |
| Max Voltage | 250V – 500V DC (Depending on specific model) |
| Max Power Consumption | 500mW (Industrial Standard) |
| Peak Wavelength | 560nm |
| Response Time | ~30ms (Highly stable transition) |
Key Features
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Industrial Surface Area: Captures significantly more photons than standard LDRs for high-accuracy lux measurement.
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High Voltage Rating: Capable of being used in more diverse electrical environments, including some direct AC-triggering circuits (with proper safety).
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Rugged Construction: Features a thick, high-transparency epoxy coating designed to withstand harsher conditions.
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Wide Angle Detection: Excellent for ambient light monitoring where the light source is not directional.
